Nano-communication devices play the vital role in the medical field in order to improve the quality of human life. They can be widely used because it can access small and delicate body sites non-invasively, where traditional medical devices are inefficient. In this paper, a brief study about the current models, various communication paradigms, antenna design, radio channel models and nano network models of the nano technology is presented. Also, the open research areas are illustrated for future development in the field.